Answer:
Falstaffian nature.
Explanation:
In the statement "Trent's Falstaffian nature makes him stand out at a party", 'Falstaffian nature' is the source of the allusion.
We know that allusion is a figure of speech that alludes or make indirect references of something with a person, thing, place, or incident.
Therefore, 'Falstaffian nature' is the correct answer because it makes an allusion to Shakespeare's fictitious character Sir John Falstaff who is known for his wits and humour.
Through this allusion we come to understand that Trent is a witty and humorous person who can easily stand out in the crowd.
